Agree - just look at Leeds, who Bielsa works like absolute dogs.
I read an interesting story about Dallas who, I think, topped the distance covered for the entire PL this season(?). During Bielsa's first pre-season, he had the players live at their Thorpe Arch Training Ground, so he could give them 3 x sessions a day, morning, afternoon and early evening, while also making sure they got a good night's rest.
Dallas' wife was v.heavily pregnant, already with two other young kids, whilst his and her families were all in NI, so she had no support locally. Dallas asked whether he could use the lunch hour to nip home to see her for a few minutes and Bielsa said "No", in a manner that told SD that if he didn't like it, then there'd be no future for him Leeds. He chose to "like" it (obv)